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CONDITION MONITORING FOR POWER TRANSFORMERS

CONDITION MONITORING FOR POWER TRANSFORMERS. C. D. UPADHYAY ME SECOND SEMESTER. Doubts raised by users. Whether oil filteration or dry out Criterions of stopping dryout/filteration Whether overhauling/reinsulation Frequency of condition monitoring Oil mixing ---------- preconditions

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CONDITION MONITORING FOR POWER TRANSFORMERS

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  1. CONDITION MONITORING FOR POWER TRANSFORMERS C. D. UPADHYAY ME SECOND SEMESTER

  2. Doubts raised by users • Whether oil filteration or dry out • Criterions of stopping dryout/filteration • Whether overhauling/reinsulation • Frequency of condition monitoring • Oil mixing ---------- preconditions • Dissolved Gas Analyis

  3. OIL PAPER Wood (treated / parmali WINDING TANK LEADS OLTC BUSHING COOLING BANKS/ HEAT EXCHANGER AUXILIARIES Areas of concern

  4. IMPORTANT STANDARDS TRANSFORMER USER SHOULD KNOW • IS 335 • IS 12463 • IS 1866 • IS 2099 • IS 2026

  5. TRANSFORMER FOR OVERHAULING

  6. PROCESS OF OVERHAULING TESTING POST SHUT DOWN OBSERVATIONS P.t.o

  7. POST SHUT DOWN OBSERVATIONS(CONT..) OIL DRAINING DISMANTLING

  8. 125 MVA TOP COVER LIFTING

  9. GASKET REPLACEMENT INTERNAL INSPECTION PREPARING TRS FOR EVACUATION N2 PRESSURE TEST

  10. VIEW OF LEAD TAKE OFF

  11. IEEE GUIDELINES INTERNAL Inspection Winding - Lead clamping Winding support system Clamping Insulation discoloration Lead distortion Lead movement Indications of hot spots

  12. IEEE GUIDELINES INTERNAL Inspection • Loose connections - Tap leads Bushings Terminal Boards Spacers Core bolt nuts. • Physical status- Contacts Operating mechanism Coupling shafts Shielding

  13. IEEE guidelines for Internal Inspection • Oil- Odour Color Moisture Free Water • Discoloration- Tank walls Bushing Terminals Corona shields Copper connectors Bus bars

  14. Vacuumdrying Vacuum drying is based on the principle of Thermodynamics Boiling point of moisture in insulation isreduced by way of PressureReductionPrinciple Thermal energy needs to be impartedexternally for achieving faster and better moisture extraction

  15. DRY OUT PROCESS INVOLVING CYCLES

  16. Vacuum drying( continued) Under vacuum (pressure reduction)boiling point of water reduces to 500c medium of heating can be Old oil Nitrogen Hot air other methods of heating are also under use.

  17. Prepare TRS for evacuation Fill N2over air to get pressure 0.2KG/CM2 Process of dryout Attend leakages

  18. PRESSURE TEST NITROGEN PRESSURE

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